JP2541509Y2 - Rotary cutter for brush cutter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutter for a brush cutter, which uses a nylon cutter to cut weeds and lawns.

[0002]

2. Description of the Related Art When cutting weeds or lawns around fences, fences or iron poles, or in places with many obstacles, metal (usually made of steel) blades have chipped or cut blades. At present, nylon cords have come to be used as cutters because of the danger of shards of flying objects.

[0003]

As described above, when a nylon cord is used for a cutter, the wound nylon cord is greatly consumed and the nylon cord is supplied each time. However, at the time of replacing the nylon cord, the current one has a notch in the flange of the reel, and the nylon cord is taken out therefrom. Therefore, in order to replace it, all parts must be removed, the reel must be taken out of the case, the nylon cord must be wrapped around the reel, then put back into the case and assembled and used. To do was very cumbersome.

[0004] In order to eliminate such troubles, Japanese Patent Application No. 2-20847 and Japanese Patent Application No. 3-21181 have been able to achieve their objectives to some extent. However, the following problems still remain. It is the same as the conventional product.
Also, Japanese Utility Model Application No. Hei 3-21181 utilizes the fact that a nylon cord tends to come out by centrifugal force when the brush cutter is operated and the rotary cutter is rotated. When the length of the nylon cord is shortened and the nylon cord is taken out, the terminal must be pushed while the rotary cutter is rotating. Therefore, when the operator performs the operation, the support is unstable because it is rotating and it hits on a hard place on the ground,
In addition to hitting only the terminal device, the case body is also hit, and the case body and the terminal device may be damaged, causing cracks or breakage, resulting in a defective product before being sufficiently utilized.
In addition, due to instability of support when hitting the terminal device, the user felt inconvenience such that stones or lumps fly when hitting, which could pose a danger to workers or surrounding people.

[0005]

SUMMARY OF THE INVENTION The present invention solves such inconveniences, and ensures that the required amount of nylon cord is taken out with the rotary cutter stopped rotating even if the nylon cord as a cutter is quickly consumed. Can be done.
It is intended to provide a rotary cutter for a brush cutter.

That is, a bearing having a shaft hole formed therein and two long holes of an appropriate length in the longitudinal direction along the axis of the shaft hole provided opposite to each other is installed upright at the center of the bottom of the cylindrical case body. A guide tube for guiding the nylon cord is provided on both side surfaces of the case body, and between the outer peripheral surface and the inner peripheral surface of the cylindrical body, an insertion hole is provided at two places on the outer peripheral surface orthogonal to the rotation axis. The receiving flange of the cylindrical body of the reel, which is provided with a supporting flange at the lower end and a supporting flange provided with a non-slip on the outer end at the upper end, is provided with a receiving flange at the lower end of the cylindrical cylindrical body that is formed so as to be a through hole without penetrating the inner peripheral surface. The bottom side is rotatably inserted into the bearing, the main shaft with a pin hole is inserted into the shaft hole of the bearing, the stop pin is inserted into the pin hole, and it can be moved up and down by a long hole, and the cap is attached to the bearing. A screw spring is provided between the end face of the spindle and the cap so as to always push the spindle downward. A guide body provided with a plurality of claws comprising a valley and a valley is provided at the upper portion of the inner periphery of the cylinder so that the crest is upward, and a plurality of claw presses each having an unequal-side crest are provided so as to have a gap at appropriate intervals. The pin press of the pin retainer is downward, and the end face forming the short side of the presser corresponds to the valley, and the pawl and the presser are provided at the upper end of the inner periphery of the cylinder so as to face each other and maintain an appropriate interval. In a rotary cutter installed so as to be able to guide the engagement of a pin, an upper surface of a support flange so that a stopper pin hits the end portion and presses the claw press when the main shaft ascends to move the end face forming the short side of the claw press corresponding to the claw valley. Are provided to be inclined so as to have an appropriate acute angle with respect to.

To replace the nylon cord with a shorter length, turn the reel, align the insertion hole with the guide tube, turn the nylon cord through the nylon cord, and turn it in the opposite direction to the clock hand. Since there is no contact between the claw and the stop pin, the reel rotates around the bearing and winds a nylon cord around the cylinder. At this time, when the stop pin comes to the claw valley, the stop pin is pushed through the main shaft by the coil spring and engaged, and the reel is stopped in the normal rotation and continues only in the reverse direction to complete the nylon cord. Take out an appropriate amount from the winding guide tube and use it.

Further, when the nylon cord is shortened by use, the operation of the rotary cutter is stopped and the main shaft is pushed so as to hit the main shaft. At the same time when the reel is pressed and the reel is rotated a small amount, the stop pin moves on the crest of the claw by the reaction of pressing the claw press. For this reason, the stop pin does not move even if the main shaft is pushed by the coil spring, and stops on the mountain. At this time, if both ends of the nylon cord are pulled, the reel idles for the distance that the locking pin moves from the crest of the claw to the valley of the claw along the claw between the guide body and the pin holder, and the nylon cord is pulled out. Since the pin is pushed by the coil spring and hits the valley portion with the stop pin and meshes with each other, the forward rotation of the reel is stopped.

However, during actual work, when the mowing operation is started when the stop pin is stopped on the mountain, the reel in the idling state is caused by the centrifugal force and the force when the nylon cord hits the grass and cuts. The nylon cord is pulled out by the same operation as described above, and the work can be performed. When the amount of the nylon cord to be taken out increases, the reel may be rotated in the reverse direction and wound up to a predetermined length. The projections prevent the cut grass and the like from being wound around the bearing and the locking pin from falling off. Further, when the nylon cord is cut in the case body near the exit of the guide cylinder, the window and the auxiliary window are grasped by another tool (for example, tweezers or nippers) and taken out from the guide cylinder while looking through the window.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a cylindrical case main body having an opening at one end and a bottom surface 1a. A shaft hole 2 with a key is formed, and two thin long holes 3 of an appropriate length are formed along the axis of the shaft hole 2. A long hole 3 is provided at an appropriate position in the longitudinal direction so as to face each other, and a cylindrical bearing 4 having a left-hand thread screwed on the outer periphery is installed upright at the center of the bottom surface 1a of the case body 1.

Reference numeral 5 denotes an entire reel, and a receiving flange 7 which is cylindrical and can be inserted into the case body 1 at the lower end of a take-up cylinder 6.
A plurality of transparent trapezoidal windows 8 of arbitrary size are provided so that the inside can be seen, an outer edge 9 provided with a non-slip 9a on the outer periphery is provided, and an annular projection 10 is provided in a direction opposite to the outer edge 9. The supporting flange 11 is formed so that the outer edge 9 is on the inner side.
Provided at the upper end, an insertion hole 12 is provided between the outer peripheral surface and the inner peripheral surface of the cylindrical body 6 at right angles to the rotation axis, and insertion holes are provided at two places on the outer peripheral surface of the cylindrical body 6 so as not to penetrate the inner peripheral surface. A guide body 14 composed of six claws 13 formed by ridges 13a and valleys 13b is installed in the upper part of the inner periphery of the cylindrical body 6 so as to form a through hole. The pin holder 15 of the pin holder 16 provided with a plurality of sections at appropriate intervals with a gap 15a faces downward, and the end face 15b that forms the short side of the nail holder 15 corresponds to the valley 13b. At the upper end of the inner periphery of the cylindrical body 6 so that the pushers 15 face each other and maintain an appropriate interval,
An end face 15b on the short side of the claw pusher 15 corresponding to 3b is provided so as to be inclined at an appropriate acute angle θ from the upper surface of the support flange 11, and the outer edge 9 is supported in the case body 1 by the end face of the case body 1. The stored reel 5 is rotatable.

Reference numeral 17 denotes a transparent auxiliary flange having a thickness within the height of the outer edge 9, and an auxiliary window 18 corresponding to the window 8.
Are provided, a handle 19 is provided, and the handle 19 is movably provided between the support flange 11 and the receiving flange 7 with the window 8 side. Reference numeral 20 denotes a main shaft provided with a key groove on the outer periphery and a pin hole 21 formed at a suitable position near the upper end, which is inserted into the shaft hole 2 so as to be movable up and down and has a length slightly smaller than the distance of the opposed notch 15a. The pin 22 is inserted into the pin hole 21 through the elongated hole 3 to prevent the spindle 20 from falling off.

Reference numeral 23 denotes a cap having an insertion hole 24 of an appropriate size formed in the center and having an outer diameter smaller than the diameter of the projection 10. A coil spring 25 is provided on the upper end surface of the main shaft 20, and the cap 23 is attached to the bearing 4. And the coil spring 25 always pushes the main shaft 20 outward. 26
Is a cylindrical guide cylinder having an appropriate inner diameter and provided with conical guide recesses at both ends, and is provided at a position at an appropriate height on the side surface of the case body 1 (generally a position corresponding to the through hole 12). Sections (two sections are shown in the figure) are provided to enable the nylon cord 27 to be guided. Reference numeral 27 denotes a rope-shaped nylon cord of an appropriate length, which is drawn out of the guide cylinder 26 through the through hole 12 and drawn out of the guide cylinder 26 so that it can be wound around the cylindrical body 6 and an appropriate amount is taken out of the case body 1 and used as a cutter. .

In use, when the nylon cord 27 becomes short and must be replaced, the reel 5 is rotated by the non-slip 9a to align the position of the insertion hole 12 and the guide cylinder 26 to guide the new nylon cord 27. Cylinder 26
As shown in FIG. 3, the case main body 1 is inserted through the insertion hole 12 so as to be substantially at the center of the nylon cord 27.
When the reel 5 is rotated in the opposite direction (the direction of the arrow in FIG. 2) to the clock hand by the slip stopper 9a, the stopper pin 22 is pushed by the claw 13 of the guide body 14 and moves outward along the elongated hole 3. Then, the coil spring 25 is
, The reel 5 rotates, and the nylon cord 27 is wound on the cylindrical body 6.

At this time, when the stop pin 22 comes to the valley portion 13b of the claw 13, the stop pin 22 is pushed by the coil spring 25 to be in the meshing state, and the reel 5 is stopped in the normal direction while being stopped in the forward direction (reverse to the clock hand). Direction), the entire nylon cord 27 is wound up, and both ends are used out of the guide tube 26 by an appropriate amount.

Further, when the nylon cord 27 protruding from the case body 1 is shortened by use, the operation of the rotary cutter is stopped by the driving device and the main shaft 20 is hit so as to hit the claw 13 at the valley portion 13b. The stop pin 22, which has been in the state, rises and hits the end face 15b, pushes the claw pusher 15 as shown by the two-dot chain line in FIG. 5, rotates the reel 5 a little, and simultaneously presses the claw pusher 15 as shown in FIG. With nail 1
The stop pin 22 moves onto the third peak 13a. For this reason, even if the force for pushing the main shaft 20 is lost and the main shaft 20 is pushed by the coil spring 25, the stop pin 22 does not move and the peak portion 13a
Parked on top. At this time, if both ends of the nylon cord 27 are pulled, the reel 5 idles for a distance that the stop pin 22 moves from the crest 13a to the valley 13b along the claw 13 between the guide 14 and the pin holder 16 and the guide cylinder 26 At the same time as the nylon cord 27 is pulled out, the main shaft 20 is pushed by the expansion and contraction force of the coil spring 25 and the stop pin 22 abuts on the valley portion 13b, so that the reel 5 is stopped from rotating forward.

In this state, the driving device is operated to perform the mowing operation again as a rotary cutter. During the actual work, when the locking pin 22 is moved onto the hill 13a, the driving device is operated to start the mowing work, and the reel is idled due to the centrifugal force and the pulling force when the nylon cord 27 hits the grass. , The nylon cord 27 is pulled out of the guide cylinder 26 by the same operation as described above. When the take-out amount of the nylon cord 27 increases, the reel 5 may be rotated in the reverse direction and wound up to a predetermined length. The projections 10 prevent the cut grass and the like from being wound around the bearing 4 and the stopper pin 22 from falling off. Further, when the nylon cord 27 is cut in the case body 1 near the exit of the guide tube 26, the window 8 and the auxiliary window 18
Is grasped with another tool (for example, tweezers or nipper) and taken out from the guide tube 26 while looking through the fitting window 8.

[0018]

[Effects of the Invention] As described above, the present invention does not require the trouble of removing and disassembling the assembled parts one by one during the work, and the time required for disassembling and assembling is not required, and the rotation of the rotary cutter is stopped on the spot during the work, so that it is easy. Nylon cords of a certain size can be taken out and replaced with simple operations, and there are many features such as no damage to the case body, no danger to workers and surrounding people, and comfortable and enjoyable mowing work. This is a very excellent device for practical use.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the present invention.

FIG. 2 is a partially cutaway plan view of the present invention.

FIG. 3 is a view showing a state in which a nylon cord according to the present invention is inserted.

FIG. 4 is a sectional view of the locking pin guide of the present invention.

FIG. 5 is an operation state diagram of the first stage of the locking pin when the main shaft is pressed according to the present invention.

FIG. 6 is an operation state diagram of a second stage of the locking pin when the main shaft of the present invention is pressed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 1a Bottom surface 2 Shaft hole 3 Elongated hole 4 Bearing 5 Reel 6 Cylindrical body 7 Receiving flange 8 Window 9 Outer edge 9a Non-slip 10 Projection 11 Support flange 12 Insertion hole 13 Claw 13a Peak portion 13b Valley portion 14 Guide member 15 Claw pusher 15a gap 15b end face 16 pin retainer 17 auxiliary flange 18 auxiliary window 19 handle 20 main shaft 21 pin hole 22 stop pin 23 cap 24 insertion hole 25 coil spring 26 guide cylinder 27 nylon cord

Claims (1)

(57) [Scope of request for utility model registration] 1. A bottom surface of a cylindrical case body 1 having a shaft hole 2 formed therein and a bearing 4 provided with two long holes 3 of an appropriate length in the longitudinal direction along the axis of the shaft hole 2 facing each other. 1a, the guide tube 26 is installed upright in the center of the case 1 and guides the nylon cord 27 on both sides of the case body 1. Between the outer peripheral surface and the inner peripheral surface of the cylindrical body 6, the insertion hole 12 is orthogonal to the rotation axis. An insertion opening is provided at two places on the outer peripheral surface, and a receiving flange 7 is provided at the lower end of a cylindrical tubular body 6 that is formed so as to form a through hole without penetrating the inner peripheral surface, and a non-slip 9a is provided at the upper end. The receiving flange 7 of the cylinder 6 of the reel 5 on which the support flange 11 is installed is rotatably inserted into the bearing 4 with the bottom surface 1a side, and the main shaft 20 having the pin hole 21 is inserted into the shaft hole 2 of the bearing 4. The stopper pin 22 is inserted into the pin hole 21 so as to be vertically movable in the elongated hole 3 and the cap 23
Is provided on the bearing 4 so that a coil spring 25 is provided between the end surface of the main shaft 20 and the cap 23 so as to always push the main shaft 20 downward, and a plurality of claws 13 including a peak portion 13a and a valley portion 13b are provided. Is provided on the inner peripheral upper portion of the cylindrical body 6 so that the peak portion 13a is located upward, and the claw pusher 15 having an
The pin holder 15 of the pin holder 16 composed of a plurality of pieces is directed downward,
End face 15 which forms the short side of claw pusher 15 in valley 13b
In a rotary cutter provided at the upper end of the inner periphery of the cylindrical body 6 so that the claw 13 and the claw pusher 15 face each other and maintain an appropriate interval, and the engagement guide of the locking pin 22 is provided, A rotary cutter for a brush cutter, characterized in that an end face 15b forming the short side of the claw press 15 corresponding to the portion 13b is provided at an appropriate acute angle with respect to the upper surface of the support flange 11.